Knee brace



FIG. 1 is a front view of a knee brace showing my new design;

FIG. 2 is a back view thereof with the lower fastening strap fastened;

FIG. 3 is a left side view thereof with the lower fastening strap laidflat; and,

FIG. 4 is a right side view thereof with the lower fastening strap laidflat.

The broken lines in the drawings represent environmental structure andform no part of the claimed design.

We claim the ornamental design for a knee brace, as shown and described.